@hamsterman I have proof of infection by an enterovirus.
As a follow-up, I have to admit I have been regressing in the last year. I do believe nimotop is still helping me, but unfortunately the illness is progressing. It helps me sleep and function a little better still, but not as much as I thought in the beginning. Also, since it's very expensive, I am cutting down as much as I can. Right now I am taking a small dose in the morning only. Since I am worse in winter, most probably I will have to increase my dose in december or so.